{
  "bibcode": "2020GCN.26727....1L",
  "body": "F. Longo (University and INFN, Trieste), D. Kocevski (NASA/MSFC)\nand M. Arimoto (Kanazawa Univ.) report on behalf of the Fermi-LAT Collaboration:\n\nWe have searched data collected by the Fermi Large Area Telescope (LAT) on\nJanuary 12th, 2020, for possible high-energy (E > 100 MeV) gamma-ray emission in\nspatial/temporal coincidence with the LIGO/Virgo trigger S200112r (GCN 26715).\n\nWe define \"instantaneous coverage\" as the integral over the region of the LIGO\nprobability map that is within the LAT field of view at a given time,\nand \"cumulative\ncoverage\" as the integral of the instantaneous coverage over time.\nFermi-LAT was in SAA at the time of the trigger of the event\n(T0 =2020-01-12 15:58:38.094 UTC), started to observe the LIGO\nprobability region around 1.8 ks later with an instantaneous coverage of 30%\nand reached 100% cumulative coverage of the LIGO probability after about 10 ks.\n\nWe performed a search for a transient counterpart within the observed region of\nthe 90% contour of LIGO map in a fixed time window from T0 +1.8 ks to\nT0 + 10 ks.\n\nTwo significant excess (with TS>25) were found.\nThe first one at R.A., Dec. = 215.8, 32.4 is likely associated with\nthe known and\ncurrently active source OQ 334, the second one at R.A., Dec. = 57.2,\n-27.8 is instead\nlikely associate with the source PKS 0346���27, also currently active.\n\nWe also performed a search which adapted the time interval of the\nanalysis to the\nexposure of each region of the sky, and no additional excesses were found.\n\nEnergy flux upper bounds for the fixed time interval between 100 MeV and 1 GeV\nfor this search vary between 1.6e-10 and 4.3e-07 [erg/cm^2/s].\n\nThe Fermi-LAT point of contact for this event is\nF.Longo (francesco.longo@ts.infn.it).\n\nThe Fermi-LAT is a pair conversion telescope designed to cover\nthe energy band from 20 MeV to greater than 300 GeV\nIt is the product of an international collaboration between\nNASA and DOE in the U.S. and many scientific institutions\nacross France, Italy, Japan and Sweden.",
  "circularId": 26727,
  "createdOn": 1578907481000,
  "email": "franzlongo1969@gmail.com",
  "subject": "LIGO/Virgo 200112r: No counterpart candidates in Fermi-LAT observations",
  "submitter": "Francesco Longo at U of Trieste,INFN Trieste  <franzlongo1969@gmail.com>"
}